Which element has the highest electronegativity? MCQ with Answer and Explanation

Question
Which element has the highest electronegativity?
A. Oxygen
B. Fluorine
C. Nitrogen
D. Chlorine
Answer: Option B
Solution (By JKSSB Mock Tests)
Fluorine is the most electronegative element with a Pauling electronegativity of 3.98. Electronegativity increases across a period and decreases down a group. Thus, among the halogens, F > Cl > Br > I. Oxygen (3.44) is second. Electronegativity determines bond polarity. Because of its small size and high effective nuclear charge, fluorine strongly attracts bonding electrons. Noble gases are not assigned electronegativity values (except Kr, Xe).
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Question #1
During electrolysis, reduction takes place at the:
A. Salt bridge
B. Anode
C. Electrolyte
D. Cathode
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Correct Answer: Option D

Explanation:
In an electrochemical cell, reduction (gain of electrons) always occurs at the cathode, regardless of whether the cell is electrolytic or galvanic. At the anode, oxidation (loss of electrons) occurs. Memory aid: 'RED CAT' (REDuction at CAThode), 'AN OX' (OXidation at ANode). In electrolysis, the cathode is connected to the negative terminal of the battery, attracting cations which get reduced.
This question belongs to: Science chemistry
Question #2
Gamma rays have the highest penetration power because they:
A. Carry positive charge
B. Are heaviest
C. Have no mass and no charge
D. Are slowest
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Correct Answer: Option C

Explanation:
Gamma rays are electromagnetic waves with no rest mass and no charge, so they do not readily interact with matter via ionization compared to alpha and beta particles. They can penetrate deep into materials, requiring dense lead or thick concrete for shielding. Alpha and beta particles interact strongly via charge, losing energy quickly. Gamma rays are similar to X-rays but from nuclear origin.
This question belongs to: Science chemistry
Question #3
Glass is made by heating sand with:
A. Sodium chloride and calcium carbonate
B. Potassium nitrate and lime
C. Alumina and silica
D. Sodium carbonate and calcium carbonate
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Correct Answer: Option D

Explanation:
Soda-lime glass is produced by fusing silica (SiO₂) with sodium carbonate (Na₂CO₃) and calcium carbonate (CaCO₃) at high temperature. Na₂CO₃ acts as flux to lower melting point, CaCO₃ provides stability. Reaction: Na₂CO₃ + SiO₂ → Na₂SiO₃ + CO₂. Sodium chloride is not used. Potassium compounds make harder glass.
This question belongs to: Science chemistry
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